title: [Centerpiece plating in the cervical single open-door laminoplasty].
abstract: OBJECTIVE
  To evaluate the value of the Centerpiece plate in the cervical single open-door laminoplasty and compared its advantages with conventional suture fixation methods.
  
  
  METHODS
  From December 2009 to August 2011,32 patients with cervical spondylotic myelopathy were treated with operation. Of them, 15 cases underwent cervical single open-door laminoplasty and Centerpiece plate fixation (group A),there were 8 males and 7 females,aged from 51 to 65 years old with an average of 60.5 years and ranged in course of disease from 2 to 15 months; 17 cases underwent cervical single open-door laminoplasty and silk suture fixation (group B), there were 9 males and 8 females, aged from 49 to 66 years old with an average of 61.5 years and ranged in course of disease from 1 to 14 months. All the patients with unsteady gait symptom before operation and cervical MR imaging showed spinal cord compression and denaturation. According to standard of Japanese Orthopaedics Association (JOA) to evaluate the spinal nervers function before operation and at 6 months after operation;according to CT scan to determine the sagittal diameter (AP) of upper vertebral canal and cervical activity (ROM).
  
  
  RESULTS
  All the patients were followed up from 8 to 20 months with an average of 13 months. All the incisions healed well and no complications such as internal fixation loosening and breakage,spinal cord injury, reclose-door were found. Postoperative symptoms relieved obviously and MRI and CT showed vertebral canal volume expanded significantly. Operative time and blood loss in group A were respectively (155.0+/-12.3) min, (407.0+/-11.8) ml and in group B were respectively (148.0+/-14.4) min, (398.0+/-15.4) ml. There was no significantly differenc, between two groups (P>0.05). JOA score in group A improved from preoperative 9.1+/-2.6 to postoperative 15.5+/-1.8 and in group B improved from preoperative 9.3 +/- 2.1 to postoperative 13.1 +/- 2.5 (P<0.05). CT sagittal diameter (AP) in group A increased from preoperative (10.7+/-2.4) mm to postoperative (17.6+/-3.2) mm and in group B increased from preoperative (11.6+/-1.7) mm to postoperative (15.9+/-2.0) mm (P<0.05). Cervical activity (ROM) in group A be- fore and after operation were respectively (51.0+/-2.6) degrees, (45.0+/-3.5) degrees and in group B were respectively (52.0+/-1.8) and (42.0+/-2.4). There was no significantly difference before operation between two groups (P>0.05) and there was significantly difference after operation between two groups (P<0.05).
  
  
  CONCLUSIONS
  Treatment of cervical spondylotic myelopathy with posterior single open-door laminoplasty and Centerpiece plate fixation can enlarge spinal canal volume,keep original cervical activity, improve postoperative JOA score. The method has obviously advantages compared with traditional suture fixation methods.
authors.affiliation: Department of Spinal Surgery, the Affiliated Lishui Central Hospital of Wenzhou Medical College, Lishui 323000, Zhejiang, China. zglswzw@163.com
authors.forename: Zhong-Wei
authors.initials: ZW
authors.lastname: Wu
authors.forename: Shao-Jun
authors.initials: SJ
authors.lastname: Ren
authors.forename: Xiao-Yong
authors.initials: XY
authors.lastname: Sheng
authors.forename: Song-Qiang
authors.initials: SQ
authors.lastname: Li
authors.forename: Ke-Jun
authors.initials: KJ
authors.lastname: Zhu
authors.forename: Deng-wei
authors.initials: DW
authors.lastname: He
mesh_terms: D000368:Aged; D001860:Bone Plates; D002574:Cervical Vertebrae / Q000601:surgery*; D005260:Female; D006801:Humans; D007796:Laminectomy / Q000379:methods*; D008297:Male; D008875:Middle Aged; D013115:Spinal Canal / Q000601:surgery; D055009:Spondylosis / Q000209:etiology / Q000601:surgery*